CN1637813A - Flat panel display device and driving method thereof - Google Patents

Flat panel display device and driving method thereof Download PDF

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Publication number
CN1637813A
CN1637813A CNA2004100426778A CN200410042677A CN1637813A CN 1637813 A CN1637813 A CN 1637813A CN A2004100426778 A CNA2004100426778 A CN A2004100426778A CN 200410042677 A CN200410042677 A CN 200410042677A CN 1637813 A CN1637813 A CN 1637813A
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signal
digital data
green
bit digital
red
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李汉相
赵南旭
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LG Display Co Ltd
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LG Philips LCD Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

A flat panel display device and a driving method thereof wherein an input data is modulated to realize accurate color with a single gamma voltage. The flat panel display device includes a data converter having a look-up table and inputted with Red, Green and Blue N-bit digital data signals, the data converter converting the Red, Green and Blue N-bit digital data signals into Red, Green and Blue M-bit digital data signals, respectively, referring to the look-up table, wherein each of N and M is an integer, M is greater than N, and each of the Red, Green and Blue M-bit digital data signals corresponds to a gray scale number; a gamma voltage generator generating a plurality of gamma voltages corresponding to the gray scale numbers; and a data driving circuit inputted with the gamma voltages, the data driving circuit converting the Red, Green and Blue M-bit digital data signals into Red, Green and Blue analog video signals, respectively, and applying the Red, Green and Blue analog video signals to respective Red, Green and Blue pixels.

Description

Panel display apparatus and driving method thereof
The application requires to enjoy korean patent application P2003-100653 number the rights and interests of submitting on Dec 30th, 2003, and it is being hereby incorporated by reference.
Technical field
The present invention relates to panel display apparatus, specifically, relate to a kind of panel display apparatus and driving method thereof, wherein modulate inputting video data, realize accurate color to use single gamma voltage generator.
Background technology
In recent years, developed the various panel display apparatus that reduced weight and size that have, they can eliminate the shortcoming relevant with cathode ray tube (CRT).Such panel display apparatus comprises LCD (LCD), Field Emission Display (FED), plasma display panel (PDP) and electroluminescence (EL) plate.
In these display device, the EL display is a kind of self luminous device, is that the recombination with electronics and hole excites phosphorated material in this device.According to the source material of luminescent layer, usually the EL display device is divided into inorganic EL device and organic El device.The EL display device is owing to it has that low voltage drive, autoluminescence, size are thin, the advantage of wide visual angle, rapid response speed and high-contrast is paid close attention to widely.
Fig. 1 is the sectional view that expression is used for explaining the organic EL structure of prior art of EL display device principle of luminosity.
With reference to Fig. 1, organic El device comprises electron injecting layer 4, electronic carrier layer 6, luminescent layer 8, hole 10 and the hole injection layer 12 that is successively set between negative electrode 2 and the anode 14.
If (promptly in transparency electrode, anode 14) with metal electrode (promptly, when applying voltage negative electrode 2), the electronics that produces from negative electrode 2 just moves to the luminescent layer 8 by electron injecting layer 4 and electronic carrier layer 6, moves to the luminescent layer 8 by hole injection layer 12 and hole 10 from the hole that anode 14 produces simultaneously.Luminescent layer 8, collide and recombination generation light from the electronics and the hole of electronic carrier layer 6 and hole 10 inflows like this, respectively.This light by transparency electrode (that is, anode 14) thus being launched into the outside demonstrates image.Because the brightness of organic El device is proportional with the electric current that is applied, and, therefore, usually anode 14 is linked to each other with positive current source not with to be loaded into this voltage that installs each end proportional.
As shown in Figure 2, adopt the active matrix EL display device of this organic El device to comprise: one has the data driver 20 that gate drivers 18 and that the EL panel 16, that is arranged on the pixel 28 of infall between gate lines G L and the data line DL is used to drive EL panel 16 gate lines G L is used to drive EL panel 16 data line DL.The active matrix EL display device also comprises sequential (timing) controller 40, and it is used for the driving sequential of control data driver 20 and grid controller 18, and applies digital data signal RGB to data driver 20.Time schedule controller 40 will be from the outside (promptly, system) digital data signal RGB imposes on data driver 20, and uses vertical/horizontal synchronizing signal and major clock from the outside to produce grid control signal GCS that needs driving grid driver 18 and the data controlling signal DCS that needs driving data driver 20.
Gate drivers 18 imposes on scanning impulse gate lines G L1 to GLn successively under the control of time schedule controller 40.Data driver 20 responses will convert analog video signal to from the digital data signal of time schedule controller 40 inputs from the data controlling signal (DCS) of time schedule controller 40.Data driver 20 also will with the synchronous analog video signal of scanning impulse by line impose on data line DL1 to DLm.
When scanning impulse imposed on gate lines G L, each in a plurality of pixels 28 received the data-signal from data line DL, thereby produced the light corresponding to data-signal.At last, as shown in Figure 3, each pixel 28 all comprises EL unit (cell) OEL, and it has the negative electrode that is connected to ground voltage supplies GND; With a unit drive 30, it is connected to the anode of gate lines G L, data line DL, supply-voltage source VDD and EL unit OEL, thereby drives EL unit OEL.
Unit drive 30 comprise switching thin-film transistor T1, drive thin film transistors T2 and be connected supply-voltage source VDD and first node N1 between capacitor C STDescribed switching thin-film transistor T1 has the gate terminal that is connected to gate lines G L, be connected to the source terminal of data line DL and be connected to the drain electrode end of first node N1, and described drive thin film transistors T2 has the gate terminal that is connected to first node N1, be connected to the source terminal of supply-voltage source VDD and be connected to the drain electrode end of EL unit OEL.
When scanning impulse imposed on gate lines G L, switching thin-film transistor T1 was switched on, thereby the data-signal that will offer data line DL imposes on first node N1.The data-signal that offers first node N1 is charged to capacitor C STIn, and impose on the gate terminal of drive thin film transistors T2.Drive thin film transistors T2 response imposes on the data-signal of its gate terminal, and control flows into magnitude of current I the EL unit OEL from supply-voltage source, thus the quantity of the light that control is sent from EL unit OEL.And, even because also can be during stopcock thin film transistor (TFT) T1 from capacitor C STDischarge data-signal, therefore, drive thin film transistors T2 apply one from the electric current I of supply-voltage source VDD up to the data-signal that next frame is provided EL unit OEL's is luminous so that keep.
The EL display device of prior art will impose on each EL unit OEL so that EL unit OEL is luminous with the proportional current signal of input data, thereby demonstrate image.At this, EL unit OEL comprises that the G unit OEL and that a R unit OEL, with redness (R) phosphorated material has green (G) phosphorated material has the B unit OEL of blueness (B) phosphorated material, so that realize color.It is that a pixel is realized color that three R, G and B unit OEL combine.At this, each in R, G and the B phosphorated material all has different luminescence efficiencys.In other words, impose on R, G and B unit OEL if will have the data-signal of same level, the luminance level of R, G and B unit OEL will become and have nothing in common with each other so.Like this, the gamma electric voltage of each R, G and B unit is set at each other has nothing in common with each other, so that compensate the R, the G that are in same voltage level and the different brightness of B unit for the white balance (white balance) of R, G and B unit.Therefore, as shown in Figure 4, R, G and B unit comprise a R gamma voltage generator 32, a G gamma voltage generator 34 and a B gamma voltage generator 36, and they are used for producing respectively the gamma electric voltage with different voltage levels.
As shown in Figure 5, R gamma voltage generator 32 produces n gamma electric voltage (n is an integer) here, in the mode corresponding to different brightness datas.At last, R gamma voltage generator 32 comprises (n+1) that be linked in sequence between the first supply-voltage source VDD1 and ground voltage supplies GND individual resistance R 11, R12, and R13, R14 ..., Rln+1.The resistance R 11 of such R gamma voltage generator 32 from being linked in sequence between the first supply-voltage source VDD1 and ground voltage supplies GND, R12, R13, R14, n green gamma voltages RGMA1 is to RGMAn for the output of node between the Rln+1, described n green gamma voltages RGMA1 to RGMAn corresponding to the red digital data signal R that is input to data driver 20 from time schedule controller 40 DataFigure place.
G gamma voltage generator 34 produces n gamma electric voltage in the mode corresponding to as shown in Figure 5 different brightness datas.At last, G gamma voltage generator 34 comprises (n+1) that be linked in sequence between the second supply-voltage source VDD2 and ground voltage supplies GND individual resistance R 21, R22, and R23, R24 ..., R2n+1.The resistance R 21 of such G gamma voltage generator 34 from being linked in sequence between the second supply-voltage source VDD2 and ground voltage supplies GND, R22, R23, R24, n green gamma electric voltage GGMA1 of node between R2n+1 output be to GGMAn, the individual green gamma electric voltage GGMA1 of described n to GGMAn corresponding to the green digital data signal G that is input to data driver 20 from time schedule controller 40 DataFigure place.
B gamma voltage generator 36 produces n gamma electric voltage in the mode corresponding to as shown in Figure 5 different brightness datas.At last, B gamma voltage generator 36 comprises (n+1) that be linked in sequence between the 3rd supply-voltage source VDD3 and ground voltage supplies GND individual resistance R 31, R32, and R33, R34 ..., R3n+1.The resistance R 31 of such B gamma voltage generator 36 from being linked in sequence between the 3rd supply-voltage source VDD3 and ground voltage supplies GND, R32, R33, R34, n blue gamma electric voltage BGMA1 of node between R3n+1 output be to BGMAn, the individual blue gamma electric voltage BGMA1 of described n to BGMAn corresponding to the blue digital data signal B that is input to data driver 20 from time schedule controller 40 DataFigure place.
In these first to the 3rd supply-voltage source VDD1, VDD2 and VDD3, the magnitude of voltage that the first supply-voltage source VDD1 produces will be higher than the second and the 3rd supply-voltage source VDD2 and VDD3, and its reason is that R, G have different luminescence efficiencys with the B phosphorated material.In this case, the magnitude of voltage of the 3rd supply-voltage source VDD3 generation is lower than the second supply-voltage source VDD2.
Therefore, data driver 20 utilizes corresponding to a plurality of gamma electric voltage RGMA1 to RGMAn; The gamma electric voltage RGMA1 of GGMA1 to GGMAn and BGMA1 to the input digital data signal of BGMAn is to RGMAn; GGMA1 produces analog video signal to GGMAn and BGMA1 to BGMAn, and described gamma electric voltage RGMA1 is to RGMAn; GGMA1 is provided by R gamma voltage generator 32, G gamma voltage generator 34 and B gamma voltage generator 36 respectively to BGMAn to GGMAn and BGMA1, and data driver 20 to be imposing on data line DL with the synchronous mode of sweep signal with the analog video signal that is produced, thereby shows desired image on EL panel 20.
Yet, the problem of the EL display device of prior art is, because data driver 20 comprises R gamma voltage generator 32, G gamma voltage generator 34 and the B gamma voltage generator 36 of the white balance of the R, the G that are used to have different luminescence efficiencys and B phosphorated material, therefore increase the size of data driver, and improved its cost.
Summary of the invention
For this reason, the object of the present invention is to provide a kind of panel display apparatus and driving method thereof, it has overcome basically because the restriction of prior art and one or more problems that shortcoming causes.
The invention has the advantages that provides a kind of panel display apparatus and driving method thereof, thereby adopts single gamma electric voltage also can realize accurate color even wherein modulate incoming video signal.
Will understand that other features and advantages of the present invention by the following description or practice of the present invention.Will be better understood purpose of the present invention and other advantages by specifically described structure in instructions, claims and the accompanying drawing.
In order to realize these advantages of the present invention and other advantages, as implementing the present invention and specifically and widely describing to of the present invention, a kind of panel display apparatus for example can comprise: a data converter, it has comparison list and input has red, green and blue N-bit digital data-signal, described data converter with reference to the table of comparisons with red, green and blue N-bit digital data-signal converts to red respectively, green and blue M-bit digital data-signal, wherein each among N and the M is integer, M is greater than N, and red, in the green and blue M-bit digital data-signal each is corresponding with the gray scale number; One produces a plurality of gamma voltage generators corresponding to grey purpose gamma electric voltage; And one input the data drive circuit of gamma electric voltage is arranged, described data drive circuit converts red, green and blue look M-bit digital data-signal to red, green and blue look analog video signal respectively, and red, green and blue look analog video signal is imposed on separately red, green and blue look pixel.
According to another aspect of the present invention, a kind of method that drives panel display apparatus for example can comprise: receive red, green and blue look N-bit digital data-signal; Convert red, green and blue look N-bit digital data-signal to red, green and blue look M-bit digital data-signal respectively, wherein each among N and the M is integer, and M is greater than N, and each red, green and blue look M-bit digital data-signal is corresponding with the gray scale number; Convert red, green and blue look M-bit digital data-signal to red, green and blue look analog video signal respectively; And red, green and blue look analog video signal imposed on separately red, green and blue look pixel.
According to another aspect of the present invention, the method that a kind of driving has the panel display apparatus of a pixel for example can comprise: receive N-bit digital data-signal; Convert N-bit digital data-signal to M-bit digital data-signal, wherein each among N and the M is integer, and M is greater than N; Convert M-bit digital data-signal to analog video signal; And this analog video signal imposed on this pixel.
According to one side more of the present invention, a kind of panel display apparatus with a pixel for example can comprise: an input has the data converter of N-bit digital data-signal, it is used for converting N-bit digital data-signal to M-bit digital data-signal, wherein each among N and the M is integer, and M is greater than N; And one input the data drive circuit of M-bit digital data-signal is arranged, it is used to produce analog video signal and this analog video signal is imposed on this pixel.
Should be appreciated that above general description and the following detailed description all are exemplary and indicative description, it is intended to further specify claimed invention.
Description of drawings
Included be used for being convenient to further understand the present invention and as an illustration the accompanying drawing of an ingredient of book represented embodiments of the invention, can be used to explain principle of the present invention together with the description.
In the accompanying drawings:
Fig. 1 is the sectional view that expression is used for explaining the organic EL structure of prior art of EL display device principle of luminosity;
Fig. 2 is the schematic block diagram of structure that expression is used for the drive unit of prior art el display device;
Fig. 3 is the circuit diagram of each pixel shown in Figure 2;
Fig. 4 is the block scheme of data driver shown in Figure 2;
Fig. 5 is R, the G shown in Figure 4 and the circuit diagram of B gamma voltage generator;
Fig. 6 is the schematic block diagram of expression according to the structure of the drive unit that is used for the panel display apparatus electroluminescence display panel of the embodiment of the invention;
Fig. 7 is the table of comparisons shown in Figure 6 and the block scheme of data driver; And
Fig. 8 is the circuit diagram of gamma voltage generator shown in Figure 7.
Embodiment
Below to specifically describe the most preferred embodiment of the present invention that exemplifies in the accompanying drawings.
With reference to Fig. 6, comprise according to electroluminescence (EL) display device of the embodiment of the invention: one has the EL panel 116 that is arranged on the pixel 128 at place, point of crossing between gate lines G L and the data line DL; One is used to drive the gate drivers 118 of the gate lines G L of EL panel 116; With a data driver 120 that is used to drive the data line DL of EL panel 116.Described electroluminescence (EL) display device also comprises time schedule controller 140, it is used for the driving sequential of control data driver 120 and gate drivers 118, and will be (wherein from the N-bit digital data-signal RGB of outside, N is an integer) convert M-bit digital data-signal MRGB to (wherein, M is the integer greater than N), to apply this M-bit digital data-signal to data driver 120.
When scanning impulse imposed on gate lines G L, each in a plurality of pixels 128 received the data-signal from data line DL, thereby produced the light corresponding to data-signal.
At last, as shown in Figure 3, each pixel 128 comprises an EL unit OEL, and it has a negative electrode that is connected to ground voltage supplies GND; With a unit drive 30, it is connected to the anode of gate lines G L, data line DL, supply-voltage source VDD and EL unit OEL, thereby drives EL unit OEL.
Described unit drive 30 comprise switching thin-film transistor T1, drive thin film transistors T2 and be connected supply-voltage source VDD and first node N1 between capacitor C STDescribed switching thin-film transistor T1 has the gate terminal that is connected to gate lines G L, be connected to the source terminal of data line DL and be connected to the drain electrode end of first node N1, and described drive thin film transistors T2 has the gate terminal that is connected to first node N1, be connected to the source terminal of supply-voltage source VDD and be connected to the drain electrode end of EL unit OEL.
When scanning impulse imposed on gate lines G L, switching thin-film transistor T1 was switched on, thereby the data-signal that will offer data line DL imposes on first node N1.The data-signal that offers first node N1 is charged to capacitor C STIn, and impose on the gate terminal of drive thin film transistors T2.Drive thin film transistors T2 response imposes on the data-signal of its gate terminal, and control flows into magnitude of current I the EL unit OEL from supply-voltage source, thus the quantity of the light that control is sent from EL unit OEL.And, even because also can be during stopcock thin film transistor (TFT) T1 from capacitor C STDischarge data-signal, therefore, drive thin film transistors T2 provide one from the electric current I of supply-voltage source VDD up to the data-signal that next frame is provided EL unit OEL's is luminous so that keep.
In the course of the work, the EL display device will impose on each among a plurality of EL unit OEL so that EL unit OEL is luminous with the proportional current signal of input data, thereby demonstrate image.At this, EL unit OEL comprises that the G unit OEL and that a R unit OEL, with redness (R) phosphorated material has green (G) phosphorated material has the B unit OEL of blueness (B) phosphorated material, so that realize color.It is that a pixel is realized color that three R, G and B unit OEL combine.At this, each in R, G and the B phosphorated material all has different luminescence efficiencys.In other words, impose on R, G and B unit OEL if will have the data-signal of same level, the luminance level of R, G and B unit OEL will become and have nothing in common with each other so.Therefore, the gamma electric voltage of each R, G and B unit is set at each other has nothing in common with each other, so that compensate the R, the G that are in same voltage level and the different brightness of B unit for the self-equilibrating of R, G and B unit.
Time schedule controller 140 will be from the outside (promptly, system) digital data signal RGB imposes on data driver 120, and uses vertical/horizontal synchronizing signal and major clock from the outside to produce grid control signal GCS that needs driving grid driver 118 and the data controlling signal DCS that needs driving data driver 120.In this case, as shown in Figure 7, time schedule controller 140 comprises that one is used for and will converts the table of comparisons 142 of M-bit digital data-signal MRGB to from the N-bit digital data-signal RGB of outside.
The table of comparisons 142 comprises a R table of comparisons 144, and it is used for N-position R digital data signal R DataConvert M-bit digital data-signal MR to DataThe one G table of comparisons 146, it is used for N-position G digital data signal G DataConvert M-bit digital data-signal MG to DataWith a B table of comparisons 148, it is used for N-position B digital data signal B DataConvert M-bit digital data-signal MB to DataFor the ease of explaining, can suppose that for example, the luminescence efficiency with G unit in R, the G of different luminescence efficiencys and the B unit is two times of R unit, and the luminescence efficiency of B unit is 2.6 times of the R unit.Can also suppose that for example, the table of comparisons 142 will be from 3-position R, G and the B digital data signal R of outside Data, G DataAnd B DataConvert 5-position R, G and B digital data signal MR respectively to Data, MG DataAnd MB DataCertainly, should consider that the relation between the luminescence efficiency of R in the actual device, G and B unit adjusts the actual table of comparisons.
Therefore, as shown in table 1 below, the table of comparisons 142 is respectively with 3-position R, G and B digital data signal R Data, G DataAnd B DataConvert 5-position R, G and B digital data signal MR to Data, MG DataAnd MB DataIn this case, if 3-position R, G and B digital data signal R Data, G DataAnd B DataIn each all be to have " 111 of high-high brightness 2", consider R, G and B unit luminescence efficiency separately so, R digital data signal R DataJust be converted into " 11111 2", G digital data signal G DataBe converted into " 01111 2", and B digital data signal B DataBe converted into " 01100 2", they are 5-position R, G and B digital data signal MR by the table of comparisons 142 outputs Data, MG DataWith the MB number According toIn other words, the table of comparisons 142 is distinguished 3-position R, G and B digital data signal R Data, G DataAnd B DataIn each gray scale number.
Table 1
????RGB Data ????MR Data ????MG Data ????MB Data
????0 ????0 ????0 ????0
????1 ????4 ????2 ????2
????2 ????9 ????4 ????3
????3 ????13 ????7 ????5
????4 ????18 ????9 ????7
????5 ????22 ????11 ????8
????6 ????27 ????13 ????10
????7 ????31 ????15 ????12
Therefore, as can be seen from Table 1, the R table of comparisons 144 is with 3-position R digital data signal R DataConvert to and have 5 R digital data signals of grey purpose MR between 0 and 31 DataThe G table of comparisons 146 is with 3-position G digital data signal G DataConvert to and have 5 R digital data signals of grey purpose MG between 0 and 15 DataThe B table of comparisons 146 is with 3-position B digital data signal B DataConvert to and have 5 B digital data signals of grey purpose MB between 0 and 12 Data
As mentioned above, the table of comparisons 142 is distinguished R, G and the B digital data signal MR that converts the 5-position from the 3-position to Data, MG DataAnd MB DataIn each gray scale number, have R, the G of different luminescence efficiencys and the white balance of B unit thereby satisfy.
Gate drivers 118 imposes on scanning impulse gate lines G L1 to GLn in turn under the control of time schedule controller 140.
Data driver 120 responses will be converted to R, G and the B digital data signal MR of 5-position by the table of comparisons 142 of time schedule controller 140 from the data controlling signal DCS of time schedule controller 140 Data, MG DataAnd MB DataConvert analog video signal to.And, data driver 120 will with the synchronous analog video signal of scanning impulse by line impose on data line DL1 to DLm.At last, data driver 120 comprises a gamma voltage generator 126.
As shown in Figure 8, gamma voltage generator 126 comprises (n+1) that be linked in sequence between the first supply-voltage source VDD and ground voltage supplies GND individual resistance R 1, R2, and R3, R4 ..., Rn+1.Such gamma voltage generator 126 produces 5-position R, G and the B digital data signal MR that imports corresponding to from the table of comparisons 142 of time schedule controller 140 Data, MG DataAnd MB DataN gamma electric voltage GMA1 to GMAn, and send these gamma electric voltages to data driver 120.In other words, gamma voltage generator 126 is from resistance R 1, R2, and R3, R4 ..., each node output has n gamma electric voltage GMA1 of different voltage levels to GMAn between the Rn+1.32 different gamma electric voltage GMA of described gamma voltage generator 126 outputs, as shown in table 2 below.
Correspondingly, data driver 120 is from corresponding to the 5-position R, the G that provide from the table of comparisons 142 of time schedule controller 140 and B digital data signal MR Data, MG DataAnd MB Data Gamma voltage generator 126 in select n gamma electric voltage GMA1 to GMAn, thereby the generation analog video signal.
Table 2
??RGB Data ????GMA
????0 ????0.00
????1 ????0.16
????2 ????0.32
????3 ????0.48
????4 ????0.65
????5 ????0.81
????6 ????0.97
????7 ????1.13
????8 ????1.29
????9 ????1.45
????10 ????1.61
????11 ????1.77
????12 ????1.94
????13 ????2.10
????14 ????2.26
????15 ????2.42
??RGB Data ????GMA
????16 ????2.58
????17 ????0.00
????18 ????0.16
????19 ????0.32
????20 ????0.48
????21 ????0.65
????22 ????0.81
????23 ????0.97
????24 ????1.13
????25 ????1.29
????26 ????1.45
????27 ????1.61
????28 ????1.77
????29 ????1.94
????30 ????2.10
????31 ????2.26
Table 3
?RGB Data ???MR Data ???MG Data ???MB Data
????0 ????0.00 ????0.00 ????0.00
????1 ????0.65 ????0.32 ????0.32
????2 ????1.45 ????0.65 ????0.48
????3 ????2.10 ????1.13 ????0.81
????4 ????2.90 ????1.45 ????1.13
????5 ????3.55 ????1.77 ????1.29
????6 ????4.68 ????2.10 ????1.61
????7 ????5.00 ????2.42 ????1.94
More particularly, as can be seen from Table 3, data driver 120 response 5-position R digital data signal MR DataProduce the R analog video signal of 0～about 5V, described R analog video signal is corresponding to 32 the gamma electric voltage GMA1 to GMA32 with different voltage levels from gamma voltage generator 126.Data driver 120 response 5-position G digital data signal MG DataProduce the G analog video signal of about 0～2.42V, described G analog video signal is corresponding to the first to the 16 gamma electric voltage GMA1 to GMA16 with different voltage levels from gamma voltage generator 126.Data driver 120 response 5-position B digital data signal MB DataProduce the B analog video signal of about 0～1.94V, described B analog video signal is corresponding to the first to the 13 gamma electric voltage GMA1 to GMA13 with different voltage levels from gamma voltage generator 126.
As mentioned above, R, G that will produce from data driver 120 and B analog video signal to be imposing on data line DL with the synchronous mode of sweep signal, thereby show desired image on EL panel 116.
Meanwhile, panel display apparatus according to the embodiment of the invention has been described on the basis of EL display device.Yet, should be understood that principle of the present invention also can be applicable to other panel display apparatus.
As mentioned above, comprise according to panel display apparatus of the present invention and be used for and become the table of comparisons of M-bit digital data from the N-bit digital data-switching of outside.Panel display apparatus of the present invention is based on the different luminescence efficiencys of each red, green and blue look luminescence unit, by the table of comparisons N-bit digital data-switching is become to have different grey purpose M-position red, green and blue chromatic number digital data.Like this, just can realize accurate color according to panel display apparatus of the present invention for each red, green and blue chromatic number digital data adopts identical gamma voltage generator.Therefore, be that each red, green and blue chromatic number digital data adopts single gamma voltage generator according to panel display apparatus of the present invention, so just can reduce the size and the manufacturing cost of data driver.
Obviously, those skilled in the art need not to break away from the principle and scope of the present invention and can also make various modifications and changes to of the present invention.Therefore, the invention is intended to cover claims and the interior modifications and changes of equivalent scope thereof.

Claims (30)

1. panel display apparatus comprises:
One data converter, it has comparison list and input has red, green and blue look N-bit digital data-signal, described data converter converts red, green and blue look N-bit digital data-signal to red, green and blue look M-bit digital data-signal respectively with reference to the table of comparisons, wherein each among N and the M is integer, M is greater than N, and in the red, green and blue look M-bit digital data-signal each is corresponding with the gray scale number;
One produces a plurality of gamma voltage generators corresponding to grey purpose gamma electric voltage; And
One input has the data drive circuit of gamma electric voltage, described data drive circuit converts red, green and blue look M-bit digital data-signal to red, green and blue look analog video signal respectively, and red, green and blue look analog video signal is imposed on separately red, green and blue look pixel.
2. panel display apparatus as claimed in claim 1 is characterized in that, also comprises one to the walk around time schedule controller of device output red, green and blue look N-bit digital data-signal of data.
3. panel display apparatus as claimed in claim 1 is characterized in that data drive circuit comprises gamma voltage generator.
4. panel display apparatus as claimed in claim 1 is characterized in that, the gray scale number of red, green and blue look M-bit digital data-signal has nothing in common with each other.
5. panel display apparatus as claimed in claim 4 is characterized in that, the gray scale number of red M-bit digital data-signal is greater than the gray scale number of green and blue digital data signal.
6. panel display apparatus as claimed in claim 5 is characterized in that, the gray scale number of green M-bit digital data-signal is greater than the gray scale number of blue digital data signal.
7. panel display apparatus as claimed in claim 3 is characterized in that, imposes on the red analog data signal of pixel separately and has voltage level in about 0V to 5V scope.
8. panel display apparatus as claimed in claim 7 is characterized in that, imposes on the green analog video signal of pixel separately and has voltage level in about 0V to 2.5V scope.
9. panel display apparatus as claimed in claim 7 is characterized in that, imposes on the blue analog video signal of pixel separately and has voltage level in about 0V to 1.9V scope.
10. panel display apparatus as claimed in claim 1 is characterized in that, each in a plurality of pixels all is an electroluminescence cell.
11. a method that drives panel display apparatus comprises:
Receive red, green and blue look N-bit digital data-signal;
Convert red, green and blue look N-bit digital data-signal to red, green and blue look M-bit digital data-signal respectively, wherein each among N and the M is integer, and M is greater than N, and each red, green and blue look M-bit digital data-signal is corresponding with the gray scale number;
Convert red, green and blue look M-bit digital data-signal to red, green and blue look analog video signal respectively; And
Red, green and blue look analog video signal is imposed on separately red, green and blue look pixel.
12. method as claimed in claim 11 is characterized in that, the gray scale number of red, green and blue look M-bit digital data-signal has nothing in common with each other.
13. method as claimed in claim 12 is characterized in that, the gray scale number of red M-bit digital data-signal is greater than the gray scale number of green and blue digital data signal.
14. method as claimed in claim 13 is characterized in that, the gray scale number of green M-bit digital data-signal is greater than the gray scale number of blue digital data signal.
15. method as claimed in claim 11 is characterized in that, the step that red, green and blue look M-bit digital data-signal is converted to red, green and blue look analog video signal further comprises:
Produce corresponding to a plurality of different gamma electric voltages of grey purpose with gamma voltage generator.
16. method as claimed in claim 15 is characterized in that, imposes on the red analog video signal of pixel separately and has voltage level in about 0V to 5V scope.
17. method as claimed in claim 15 is characterized in that, imposes on the green analog video signal of pixel separately and has voltage level in about 0V to 2.5V scope.
18. method as claimed in claim 15 is characterized in that, imposes on the blue analog video signal of pixel separately and has voltage level in about 0V to 1.9V scope.
19. method as claimed in claim 11 is characterized in that, each in a plurality of pixels all is an electroluminescence cell.
20. method as claimed in claim 11 is characterized in that, each in a plurality of pixels all is a liquid crystal display.
21. a driving has the method for the panel display apparatus of pixel, comprising:
Receive N-bit digital data-signal;
Convert N-bit digital data-signal to M-bit digital data-signal, wherein each among N and the M is integer, and M is greater than N;
Convert M-bit digital data-signal to analog video signal; And
This analog video signal is imposed on this pixel.
22. method as claimed in claim 21 is characterized in that, the step that N-bit digital data-signal is converted to M-bit digital data-signal also comprises with reference to comparison list.
23. method as claimed in claim 22 is characterized in that, the step that M-bit digital data-signal is converted to analog video signal also comprises with gamma voltage generator generation gamma electric voltage.
24. the panel display apparatus with a pixel comprises:
One input has the data converter of N-bit digital data-signal, and it is used for converting N-bit digital data-signal to M-bit digital data-signal, and wherein each among N and the M is integer, and M is greater than N; With
One input has the data drive circuit of M-bit digital data-signal, and it is used to produce analog video signal and this analog video signal is imposed on this pixel.
25. panel display apparatus as claimed in claim 24 is characterized in that, data converter also comprises comparison list.
26. panel display apparatus as claimed in claim 25 is characterized in that, data converter converts N-bit digital data-signal to M-bit digital data-signal with the table of comparisons, and wherein M-bit digital data-signal is corresponding with the gray scale number.
27. panel display apparatus as claimed in claim 26 is characterized in that, also comprises a gamma voltage generator, it is used for producing corresponding to grey purpose gamma electric voltage and this gamma electric voltage is outputed to data drive circuit.
28. panel display apparatus as claimed in claim 24 is characterized in that, also comprises the time schedule controller that is used for to data converter output N-bit digital data-signal.
29. panel display apparatus as claimed in claim 27 is characterized in that, described pixel is an electroluminescence cell.
30. panel display apparatus as claimed in claim 27 is characterized in that, described pixel is a liquid crystal display.
CNA2004100426778A 2003-12-30 2004-05-31 Flat panel display device and driving method thereof Pending CN1637813A (en)

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